<template>
  <!-- banner -->
  <div class="home-banner">
    <!-- 轮播图 -->
    <div class="carousel">
      <!-- 图片容器 -->
      <ul class="carousel-body" @mouseenter="clear" @mouseleave="open">
        <!-- fade 显示的图片加上 -->
        <li
          class="carousel-item"
          v-for="(item, index) in data"
          :key="item.id"
          :class="{ fade: currentIndex === index }"
        >
          <router-link to="/">
            <img :src="item.imgUrl" />
          </router-link>
        </li>
      </ul>
      <!-- 上一张 -->
      <a href="javascript:;" class="carousel-btn prev"
        ><i class="iconfont icon-angle-left" @click="left"></i
      ></a>
      <!-- 下一张 -->
      <a href="javascript:;" class="carousel-btn next"
        ><i class="iconfont icon-angle-right" @click="right"></i
      ></a>
      <!-- 指示器 -->
      <div class="carousel-indicator">
        <!-- active 激活点 -->
        <span
          v-for="(item, index) in data"
          :key="item.id"
          :class="{ active: currentIndex == index }"
          @click="currentIndex = index"
        ></span>
      </div>
    </div>
  </div>
</template>

<script setup>
import { defineProps, ref } from 'vue'
const props = defineProps({
  data: {
    type: Array,
    required: true
  }
})
const currentIndex = ref(0)
let timer
const settime = () => {
  timer = setInterval(() => {
    currentIndex.value++
    if (currentIndex.value < 0) {
      currentIndex.value = props.data.length - 1
    } else if (currentIndex.value > props.data.length - 1) {
      currentIndex.value = 0
    }
  }, 3000)
}
settime()

const clear = () => {
  if (timer) {
    clearInterval(timer)
  }
}

const open = () => {
  settime()
}

const left = () => {
  const newcurrt = currentIndex.value--
  // if (currentIndex.value < 0) {
  //   currentIndex.value = props.data.length - 1
  // } else if (currentIndex.value > props.data.length - 1) {
  //   currentIndex.value = 0
  // }
  filteritem(newcurrt)
}

const right = () => {
  const newcurrt = currentIndex.value++
  // if (currentIndex.value < 0) {
  //   currentIndex.value = props.data.length - 1
  // } else if (currentIndex.value > props.data.length - 1) {
  //   currentIndex.value = 0
  // }
  filteritem(newcurrt)
}

const filteritem = (newcurrt) => {
  if (currentIndex.value < 0) {
    currentIndex.value = props.data.length - 1
  } else if (currentIndex.value > props.data.length - 1) {
    currentIndex.value = 0
  }
}
</script>

<style lang="scss" scoped>
.home-banner {
  width: 1240px;
  height: 450px;
  position: absolute;
  left: 0;
  top: 0;
  z-index: 98;
}
.carousel {
  .carousel-btn.prev {
    left: 270px !important;
  }
  .carousel-indicator {
    padding-left: 250px !important;
  }
}
.carousel {
  width: 100%;
  height: 100%;
  min-width: 300px;
  min-height: 150px;
  position: relative;
  .carousel {
    &-body {
      width: 100%;
      height: 100%;
    }
    &-item {
      width: 100%;
      height: 100%;
      position: absolute;
      left: 0;
      top: 0;
      opacity: 0;
      transition: opacity 0.5s linear;
      &.fade {
        opacity: 1;
        z-index: 1;
      }
      img {
        width: 100%;
        height: 100%;
      }
    }
    &-indicator {
      position: absolute;
      left: 0;
      bottom: 20px;
      z-index: 2;
      width: 100%;
      text-align: center;
      span {
        display: inline-block;
        width: 12px;
        height: 12px;
        background: rgba(0, 0, 0, 0.2);
        border-radius: 50%;
        cursor: pointer;
        ~ span {
          margin-left: 12px;
        }
        &.active {
          background: #fff;
        }
      }
    }
    &-btn {
      width: 44px;
      height: 44px;
      background: rgba(0, 0, 0, 0.2);
      color: #fff;
      border-radius: 50%;
      position: absolute;
      top: 228px;
      z-index: 2;
      text-align: center;
      line-height: 44px;
      opacity: 0;
      transition: all 0.5s;
      &.prev {
        left: 20px;
      }
      &.next {
        right: 20px;
      }
    }
  }
  &:hover {
    .carousel-btn {
      opacity: 1;
    }
  }
}
.slider {
  display: flex;
  justify-content: space-around;
  padding: 0 40px;
  > a {
    width: 240px;
    text-align: center;
    img {
      padding: 20px;
      width: 230px !important;
      height: 230px !important;
    }
    .name {
      font-size: 16px;
      color: #666;
      padding: 0 40px;
    }
    .price {
      font-size: 16px;
      color: $priceColor;
      margin-top: 15px;
    }
  }
}
</style>
